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p = (2 + 5i)

q = (6 - i)

pq = (2 + 5i) (6 - i)

pq = 12 + 30i - 2i - 5i2

pq = 12 + 28i + 5

pq = 17 + 28i

Its the same as multiplying polynomials. Just multiply all the combinations of terms, group, and simplify.

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